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+a simple method to keep udp2raw alive, in the case udp2raw quit
+
+#### create run.sh
+save the below content as run.sh
+```
+#! /bin/sh
+while true
+   do
+   $@
+   sleep 1
+done
+```
+
+run `chmod 755 run.sh`
+
+#### run udp2raw with run.sh
+
+```
+./run.sh ./udp2raw_amd64 -s -l0.0.0.0:4096 -r 127.0.0.1:7777  -a -k "passwd" --raw-mode faketcp
+```
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